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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Click and then reboot

I received an iMac with the screen entirely taken off, I believe they tried to remove the hard drive before getting rid of it. In the process they damaged almost every connector from the LCD to the board, at least slightly. With great precision I think I salvaged the connections and the display seems to be working fine. So I put a new HDD in the machine, booted from USB to High Sierra, initiated the install from the first menu that lets you use Disk Utility, install, etc. with no problems. Then it kept randomly turning off and rebooting throughout the install (much more often than a normal install), I let it do its thing overnight to see if it would install. Came back this morning and the country chooser was up on the screen. I clicked United states, then next, and as soon as I hit the next button, the machine clicked, shut off and rebooted. It stays in a reboot loop for a while, and then gives me the country chooser again, and the same thing happens, click... reboot.

Any idea whats going on?

I don't think the semi damaged display cables would cause this to do this.

I reset the SMC, PRAM, Tried different power outlets and cables.

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At first I was thinking your power supply was going but the fact you can leave the system running and only during a set point in the installer it fails leads me to believe the issue is either a failing RAM module and/or your CPU is over heating going into thermal shutdown.

Fixing the RAM is the easiest to do. If your system is overheating then you'll need to start off by doing a full dust clean out (fans & logic board). I would also clean and re-paste both the CPU & GPU chip heat sinks and do a full inspection of the the heat sink heat pipes you might have a bad unit.

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